Steam boiler



Feb. 12, 1935. 5 BLACK Re. 19,455

STEAM BOILER Original Filed April 19, 1927 2 Sheets-Sheet 1 I 23- 13 o iA 3 i3 x k 12$ jruenr R- W A ORNE Feb. 12, 1935. QBLACK .Re. 19,455

STEAM BOILER Original Filed April 19. 1927 2 Sheets-Sheet 2 ReissuedFeb. 12, 1935 UNITED STATES PATENT OFFICE STEAM BOILER Original No.1,920,740, dated August 1, 1933, Serial No. 184,852, April 19, 1927.

Application for reissue June 15, 1934,

1931. Serial No. 730,789

22 Claims.

The present invention relates to steam boilers, and particularly toimprovements connected with the furnaces and settings thereof, and willbe best understood from the following description and the annexeddrawings, in which Fig. 1 is a vertical sectional elevation, with partsbroken away, of an illustrative embodiment of the invention as appliedto a boiler of the Stirling type; Fig. 2 is an enlarged view of aportion of Fig. l and also a section on line 2-2 of Fig. 3;

Fig. 3 is a view of Fig. 2 taken along the line 33, and Fig. 4 is asection on the line 4-4 of Fig. 3,

Like reference characters indicate like parts in the several views.

In the illustrative embodiment, a boiler of the Stirling type has uppersteam and water drums (two only of which are shown but of which theremay be three or more) and a lower Water drum 11 connected by banks oftubes 12 and provided with baffling in the usual manner to provide aseries of longitudinal passes of the gases from the furnace 13 over thewater tubes.

In the form illustrated, the furnace is fired by a chain grate stoker 14in front of the front bank of tubes 12 and the drum 11. An arch 15 ofany suitable refractory or the like extends from the wall 16 over therear end of the stoker 14. This arch is water cooled by the tubes 17which support the arch, these tubes being connected to a header 18 andsuspended from I beams 19 forming part of the boiler setting. The otherends of the tubes 17 are connected to a header or box 20 carried on thesloping face of a support 20' on the outside of the setting wall 16,thus permitting the headers 18 and 20 to move when the tubes 17 expandand contract. The downcomer tubes 21 connect the box 20 with the drum l1and the pipe 22 connects the header 18 with the steam space of one ofthe upper steam and water drums 10. By the arrangement of pipingdescribed, it will be evident that water will flow from the drum 11through tubes 21 to the box 20 and from thence through the tubes 17, theheader 18 and the pipe 22 to the upper steam and water drum, thusproviding a water circulation through the cooling tubes 1'7. The archcarried on the tubes 17 may be formed in any desired manner, as, forinstance, by means of blocks fastened to the tubes.

The header 18 is positioned adjacent to but not in contact with the drum11, and, ordinarily, a. butt strap 11 on the drum 11 will come at apoint adjacent the furnace 13. It is desirable to protect the drum 11from the excessive effect of Renewed July 1,

the radiant heat of the furnace, and this is true particularly if a buttstrap is subjected to this heat.

In order to protect the drum, there is provided a short wall extendingup from the arch 15 to a point in front of the water drum 11, this wallhaving most of its weight carried on the arch 15. The wall itself ismade up of tile 23 provided with roceszes, as shown best in Fig. 4,which engage bulb portions 24 of backing plates 25, these backing platesbeing connected to gusset plates 26 fastened to the header 18.

It will be understood that the header 13 will have a relatively fixedposition because of its support on the E-bcams 19 and that, on the otherhand, the drum 11 will shift in its position because the boiler issuspended from the upper drums and the tubes 12 expand and contract inthe operation of boiler. For that reason, it is necessary to provide aflexible gas seal between the vertical wall and the drum 11, not only toprovide for the relative movement between the drum and the arch l5 andtherefore the wall 23, but also because of the vertical expansion of thebacking plates 25.

To this end, there is provided a hook-like portion 2'? on the upper partof the backing plates with the lower face of this hook-like portion 27extending in a direction which is substantially parallel to thedirection of motion of the drum 11 when it is moved by the changing heatconditions in the boiler and its setting. This hook-like portion mayalso be referred to as a joint member co-operating with a complementaryjoint member which comprises the angularly related parts 28 and 29. Onthe drum 11 there is provided an angle member 28 having a hook portion29 with its upper surface parallel to the lower surface of the hook-likeportion 27. Consequently these two surfaces can be brought closelytogether and will permit relative motion between the wall 23 and thedrum 11, it being understood, of course, that it is not essential forany purpose that the joint between these two hook portions shall becompletely closed.

In practice, preferably the space is filled above the hooks 2'2 and 28with a plastic heat resisting material, and cover this with a tile 23resting on the top of the vertical wall.

As a further seal between the drum 11 and the arch 15, there ispreferably provided a flexible seal extending from the drum 11 to theheader 18, this seal comprising hooked plates 30 with their hooksresting in a hook member 31 attached to the drum 11.

It will be understood that in the form of boiler illustrated. thenegative pressure in the last pass adjacent the rear setting wall 32 isrelatively greater as compared with the negative pressure in the furnacechamber 13 and that, if there was any direct path beneath the drum 11from the furnace chamber 13 to this low pressure pass, hot gases wouldbe drawn through any cracks in the seals between the arch 15 and thedrum 11 and this would tend to destroy the metallic mem bers comprisingsuch seals. To avoid this, there is exposed a portion of the drum 11 tothe atmospheric pressure of the boiler room and, in the arrangementillustrated, this is done by extending a fioor 33 from the rear wall 32to a point adjacent the lower part of the drum 11, and sealing the spacebetween the end of this floor and the drum 11 by hooked sealing members34 engaging hook members 35 attached to the drum 11. The inner end ofthe floor 33 is supported by the I-beam 19. The space on the drum 11between the members 31 and 35 is exposed to atmosphere through theopenings between the I-beams 19 and 19 The wall 16 terminates short ofthe floor 33 and the wall 32 is carried on I-beams 36 so that there is aspace between the lower part of this wall and the boiler room floor. Itwill be understood that the tubes 21 are relatively widely spaced.

With the arrangement just described, it is evident that any leakagethrough the tile 23 and the metal work connected to them would be fromthe atmosphere inward, so that the possibility of suction drawing hotgases through this tile is obviated. In other words, by the arrangementdescribed, the seal between the vertical wall and the drum 11 and theseal between the drum 11 and the header 18 and the floor 33 can berelatively incomplete without destroying the seals themselves.Furthermore, in the arrangement described, access to the header 18 maybe readily had from the exterior of the setting for purposes of cleaningthe tubes 17 and the like.

It will be understood that the arrangements which have been shown aremerely illustrative and that the embodiment of the invention may bewidely varied. It will also be understood that certain features of theinvention may be used Without other features thereof.

What is claimed is:

1. A water tube boiler of the Stirling type having an arch below and infront of the lower drum of the boiler, cooling tubes to support saidarch, a wall supporting upon and extending upwardly from said arch to apoint in front of said lower drum, backing plates for said wall havingvertical bulb portions on the front thereof, said wall comprising tileand said bulbs engaging recesses in said tile, whereby the tile arepermitted free expansion in a generally vertical direction and an anglemember connected to said lower drum, said backing plates having hookscooperating with said angle member to form a gas seal and the platesbeing substantially in contact with each other to form a continuousbacking for the tile.

2. A water tube boiler of the Stirling type having an arch below and infront of the lower drum of the boiler, cooling tubes to support saidarch, a wall supported on said arch and extending to a point in front ofsaid lower drum, backing plates for said wall having vertical bulbportions on the front thereof, said wall comprising tile and said bulbsengaging recesses in said tile, whereby the tile are permitted freeexpansion in a generally vertical direction, a member connected to saidlower drum and having an upper surface thereof extending substantiallyparallel to the motion of the lower drum produced by the expansion ofthe boiler water tubes connecting it with the upper boiler drums, andsaid backing plates having l1ooklike portions extending over said memberwith a lower surface thereof above and substantially parallel to saidupper surface of said member and the plates being substantially incontact with each other to form a continuous backing for the tile.

3. A water tube boiler of the Stirling type in which the lower drum issuspended from the upper drums with a portion of said lower drum exposedto the atmosphere outside the boiler setting, an arch below said drumand in front of said drum, with one end thereof adjacent one side ofsaid exposed portion, a fioor extending from the rear setting wall to apoint adjacent the other side of said exposed portion, and flexible gasseals connected to the lower drum at each side of said exposed portionand extending respectively to the adjacent end of said arch and theadjacent end of said floor.

4. A water tube boiler of the Stirling type in which the lower drum issuspended from the upper drums with a portion of said drum exposed tothe atmosphere outside the boiler setting, a portion of the boilersetting forming the rear of the boiler furnace and terminating adjacentone side of said exposed portion, a second portion of the boiler settingdefining a portion of the last gas pass of the boiler and terminatingadjacent the other side of said exposed portion, and a flexible gas sealbetween the drum and the adjacent end of each of said portions of thesetting.

5. A water tube boiler of the Stirling type having a wall below and infront of the lower drum of the boiler. said wall comprising coolingtubes having wall blocks carried thereby, a header to which the upperends of said tubes are connected, a second wall extending upwardly fromsaid first wall to a point in front of said lower drum, said second wallcomprising plates forming a substantially continuous backing and havingvertical bulb portions on the front thereof, tile slidably mounted onsaid bulbs, said tile resting upon the blocks on said tubes, and meansforming a flexible gas seal between said backing plates and said drum.

6. A water tube boiler comprising a lower water chamber, a wall belowand in front of said water chamber, said wall comprising cooling tubeshaving wall blocks carried thereby, a header to which the upper ends ofsaid tubes are connected, a second wall extending upwardly from saidfirst wall to a point in front of said lower water chamber, said secondwall comprising plates forming a sub stantially continuous backing andhaving vertical bulb portions on the front thereof, tile slidablymounted on said bulb portion, said tile resting upon the blocks on saidtubes, and means forming a flexible gas seal between said backing platesand said water chamber.

7. A water tube boiler comprising, in combination, a boiler fluidchamber, a boiler furnace, a refractory wall constituting a part of thefurnace and terminating at a position adjacent the chamber, means forseparately supporting the chamber and the wall, a joint member fixedrelative to the wall and extending in the direction of relativemovements of the wall and chamber, a joint member fixed relative to thechamber so as to have a part overlapping the first joint member andextending in a like direction, heat resisting material deposited betweensaid joint members to fill the space therebetween during the abovementioned relative movements to constantly provide a gas seal, and aheat resisting cover positioned over said material.

8. A water tube boiler comprising, in combination, a boiler fluidchamber, a boiler furnace, a refractory wall constituting a part of thefurnace and terminating at a position adjacent the cham ber, means forseparately supporting the chamber and the wall, a joint member fixedrelative to the wall and extending in the direction of relativemovements of the wall and chamber, a joint member fixed relative to thechamber so as to have a part overlapping the first joint member andextending in a like direction, and heat resisting material depositedover said joint members to constantly provide a gas seal, the membersbeing so arranged that stresses occurring in the wall or the chamber maynot be transmitted to the other of those structures.

9. A water tube boiler comprising, in combination, a boiler fluidchamber, a boiler furnace, a refractory wall constituting a part of thefurnace, and terminating at a position adjacent the chamber, means forseparately supporting the chamber and the wall, a joint member fixedrelative to the wall and extending in the direction of relativemovements, and a second joint member fixed relative tc the chamber so asto have a part overlapping the first joint member, one of said jointmembers having two upright and horizontally spaced parts between which apart of the other joint member moves in response to the relativemovements caused by expansion and contraction.

10. A water tube boiler comprising, in combination, a boiler fluidchamber, a boiler furnace, a refractory faced water wall constituting apart of the furnace and terminating at a position adjacent the chamber,a water-wall header, tubes in communication with the header andconstituting a part of the wall, means for separately supporting thechamber and the wall, a joint member fixed relative to the Wall andhaving a part extending in the direction of relative movements, and asecond joint member fixed relative to the chamber so as to have a partoverlapping the first joint member and extending in a like direction,one of said joint members having two spaced parts between which a partof the other joint member moves in response to the relative movementscaused by expansion and contraction.

11. In a water tube steam boiler and its furnace; a Water chamberconstituting a part of the boiler; a furnace wall at one side of thewater chamber, and an intermediate structure having upright overlappingmetallic parts connecting the water chamber and said walls to constantlymaintain a gas seal during boiler and furnace temperature changes; saidintermediate structure including fibrous heat resisting material abovethe overlapping parts between which there is relative movement tocompensate for said changes.

12. In a water tube steam boiler and its furnace; a. water chamberconstituting a part of the boiler; a furnace wall at one side of theWater chamber, and an intermediate structure having upwardly extendingoverlapping metallic parts connecting the water chamber and said wallsto constantly maintain a gas seal during boiler and furnace temperaturechanges; said intermediate structure including fibrous heat resistingmaterial above said parts, and a cover plate of ceramic heat resistingmaterial above the fibrous material; relative movements taking placebetween said parts to compensate for said changes in the maintenance ofthe gas tight enclosure.

13. In a fluid heat exchange device, a chamber containing a fluid to beheated, a furnace, a furnace wall positioned adjacent the chamber andincluding heat resistant tile, backing means forming tile aligners,interengaging means on the tile and the aligners for holding the tile, afurnace gas sealing means joining the aligners and the chamber, saidsealing means including members movable relative to each other andhaving portions arranged in sealing relation to each other, wherebyrelative movement of said last named members is permitted withoutdisrupting the seal.

14. In a boiler and furnace organization, a water chamber, a tilefurnace wall adjacent the chamber, said wall including bulb members onwhich the tiles of the wall are strung, a gas seal structure joining thewall and the chamber, said seal structure including relatively movablemembers having portions arranged in sealing relation to each other,whereby relative movement of said last named members is permittedwithout disrupting the seal.

15. A water tube boiler comprising a lower water chamber, a furnace wallbelow and in front of said water chamber, said wall comprising coolingtubes, means on the tubes for bridging the inter-tube spaces, a headerto which the upper ends of said tubes are connected, at second wallextending upwardly from said first wall to a point in front of saidlower water chamber, said sec-- end wall comprising members havingvertical bulb portions on the front thereof, tile slidably mounted onsaid bulb portions, said tile resting upon said bridging means on saidtubes, and relalively movable parts forming a flexible gas seal betweensaid members and said water chamber, said parts having portions thereofarranged in sealing relation to each other, thereby permitting relativemovements betwecn the chamber and said members without disrupting theiroperafive relationship.

16, A water tube boiler comprising, in combination, a boiler fluidchamber, a boiler furnace, a water tube furnace wall, a refractory Wallabove the wa er tube wall and constituting a part of the furnaceterminating at a position adjacent the chamber, means for separatelysupporting the chamber and the refractory wall so as to permit theirrelative movements, a gas sealing and joint structure fixed relative tothe refractory wall and extending in the direction of relative movementsof the chamber and the wall, a second gas sealing and joint structurefixed relative to the chamber so as to have a part overlapping the firstjoint structure, gas sealing means positioned between the jointstructures, and means for maintaining the sealing means in positionduring relative movements of the joint structures.

17. In a fluid heat exchange apparatus, a furnace wall structureincluding water wall tubes; a boiler structure having a part adjacentthe first structure and including a water chamber having fluid heatexchange tubes connected thereto; said structures having independentsupports at least one of which is remote from the position at which thestructures are adjacent; said two structures including adjacent andrela-- tively movable parts, one of which is on the furmace, and theother of which is on the boiler structure, said parts arranged to formconverging walls with a space between them; sealing material in saidspace between said relatively movable parts; and means maintaining saidmaterial in sealing relationship with said converging walls toconstantly effect a. gas seal between said structures during theirrelative movements due to expansion and contraction.

18. In a boiler and furnace organization, a row of spaced metallicmembers arranged along one side of the furnace, heat resisting materialsupported by said members and forming a furnace wall face, a fluid heatexchange device including water conducting tubes positioned above saidface, a Water chamber positioned near the top of said face and connectedto said tubes, independent supports for the row of members and thedevice providing for relative movements thereof near the top of saidface, and a heat resisting intermediate wall supported above the face soas to contact with said device and prevent the escape of furnace gasesbetween the face and the device.

19. A water tube boiler having a lower drum and having a wall below andin advance of the lower drum of the boiler, cooling tubes to supportsaid wall, a header located below said lower drum and connected to raidcooling tubes, a wall extending upwardly from said first named wall to apoint in front of said lower drum, and a gas seal between the drum andthe second wall, said second named wall being arranged to permitrelative motion between the drum and the first named wall whilemaintaining a gas seal between them.

20. Apparatus of the character described comprising, in combination, awater tube steam boiler having a water chamber disposed on one side of agas pass, a water wall header adjacent the water chamber and spacedtherefrom, water wall furnace tubes connected to the header and disposedin a row, heat resisting material supported by the water wall tubes topresent a flunace wall, a projection extending from the furnace walltoward the water chamber, and a wall projection supported from the waterchamber and having sliding engagement with the first mentionedprojeciion to effect a furnace gas seal operative to prevent the escapeof furnace gases between the water chamber and the water wall during allrelative movements of those devices resulting from expansion andcontraction.

21. Apparatus of the character described comprising, in combination, afluid heat exchange device having a fluid chamber at one side of a gaspass and fluid heat exchange tubes connected thereto, a furnace wallconstruction including a header spaced from said chamber but disposedadjacent thereto, water wall furnace tubes connected to the header anddisposed in a row, heat resisting material supported by the water walltubes to present a furnace wall, separate structures independentlysupporting the fluid heat exchange device and the furnace Wall so thatthere is relative movement between them, at least one of said structuresbeing located at a position remote from the position of adjacency of thedevice and the wall, and joint constructions operatively disposedbetween said device and the wall and affording a gas seal therebetween,said constructions including overlapping projections one of which isfixed relative to fluid heat exchange device and the other of which isfixed relative to the furnace wall.

22, A top supported water tube boiler com prising, in combination, afluid chamber constituting a part of the boiler and supported therefrom;a boiler furnace; a top supported refractory faced water wallconstituting a part of the furnace and supported. at a position adjacentthe chamber, said wall including a water-wall header, and tubes incommunication with the header and constituting a part of the wall; afirst joint structure fixed relative to the wall and having a partextending in the direction of relative movements; and a second jointstructure fixed relative to the chamber so as to have a part overlappingthe first joint structure and extending in a like direction, one of saidjoint structures having two spaced parts between which a part of theother joint member moves in response to the relative movements caused byexpansion and contraction.

FULLER LEHIGH COMPANY, Assignee of John E. Black, Deceased,

By ERVIN G. BAILEY,

President.

CERTIFICATE OF CORRECTION.

Reissue Ne. 19,455. February 12, 1935.

FULLER Llil-llGH COMPANY, as assignee of JOHN E. BLACK, deceased.

it is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 2,first column. line 54, claim 1, for "supporting" read supported; andsecond column, line 27, claim 4, after "said" insert the word lower; andthat the said Letters Patent should be read with these correctionstherein that the same may conform to the record of the case in thePatent Office.

Signed and sealed this 9th day of April, A. D. I935.

Leslie Frazer (Seal) Acting Commissioner of Patents.

